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51aa59a737
This PR adds a WebSocket grid feature that allows servers to communicate via
a single two-way connection.
There are two request types:
* Single requests, which are `[]byte => ([]byte, error)`. This is for efficient small
roundtrips with small payloads.
* Streaming requests which are `[]byte, chan []byte => chan []byte (and error)`,
which allows for different combinations of full two-way streams with an initial payload.
Only a single stream is created between two machines - and there is, as such, no
server/client relation since both sides can initiate and handle requests. Which server
initiates the request is decided deterministically on the server names.
Requests are made through a mux client and server, which handles message
passing, congestion, cancelation, timeouts, etc.
If a connection is lost, all requests are canceled, and the calling server will try
to reconnect. Registered handlers can operate directly on byte
slices or use a higher-level generics abstraction.
There is no versioning of handlers/clients, and incompatible changes should
be handled by adding new handlers.
The request path can be changed to a new one for any protocol changes.
First, all servers create a "Manager." The manager must know its address
as well as all remote addresses. This will manage all connections.
To get a connection to any remote, ask the manager to provide it given
the remote address using.
```
func (m *Manager) Connection(host string) *Connection
```
All serverside handlers must also be registered on the manager. This will
make sure that all incoming requests are served. The number of in-flight
requests and responses must also be given for streaming requests.
The "Connection" returned manages the mux-clients. Requests issued
to the connection will be sent to the remote.
* `func (c *Connection) Request(ctx context.Context, h HandlerID, req []byte) ([]byte, error)`
performs a single request and returns the result. Any deadline provided on the request is
forwarded to the server, and canceling the context will make the function return at once.
* `func (c *Connection) NewStream(ctx context.Context, h HandlerID, payload []byte) (st *Stream, err error)`
will initiate a remote call and send the initial payload.
```Go
// A Stream is a two-way stream.
// All responses *must* be read by the caller.
// If the call is canceled through the context,
//The appropriate error will be returned.
type Stream struct {
// Responses from the remote server.
// Channel will be closed after an error or when the remote closes.
// All responses *must* be read by the caller until either an error is returned or the channel is closed.
// Canceling the context will cause the context cancellation error to be returned.
Responses <-chan Response
// Requests sent to the server.
// If the handler is defined with 0 incoming capacity this will be nil.
// Channel *must* be closed to signal the end of the stream.
// If the request context is canceled, the stream will no longer process requests.
Requests chan<- []byte
}
type Response struct {
Msg []byte
Err error
}
```
There are generic versions of the server/client handlers that allow the use of type
safe implementations for data types that support msgpack marshal/unmarshal.
84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
// Copyright (c) 2015-2023 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package cmd
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import (
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"context"
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"crypto/tls"
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"sync/atomic"
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"github.com/minio/minio-go/v7/pkg/set"
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"github.com/minio/minio/internal/fips"
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"github.com/minio/minio/internal/grid"
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xhttp "github.com/minio/minio/internal/http"
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"github.com/minio/minio/internal/rest"
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)
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// globalGrid is the global grid manager.
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var globalGrid atomic.Pointer[grid.Manager]
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// globalGridStart is a channel that will block startup of grid connections until closed.
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var globalGridStart = make(chan struct{})
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func initGlobalGrid(ctx context.Context, eps EndpointServerPools) error {
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seenHosts := set.NewStringSet()
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var hosts []string
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var local string
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for _, ep := range eps {
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for _, endpoint := range ep.Endpoints {
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u := endpoint.GridHost()
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if seenHosts.Contains(u) {
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continue
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}
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seenHosts.Add(u)
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// Set local endpoint
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if endpoint.IsLocal {
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local = u
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}
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hosts = append(hosts, u)
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}
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}
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lookupHost := globalDNSCache.LookupHost
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if IsKubernetes() || IsDocker() {
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lookupHost = nil
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}
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g, err := grid.NewManager(ctx, grid.ManagerOptions{
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Dialer: grid.ContextDialer(xhttp.DialContextWithLookupHost(lookupHost, xhttp.NewInternodeDialContext(rest.DefaultTimeout, globalTCPOptions))),
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Local: local,
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Hosts: hosts,
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AddAuth: newCachedAuthToken(),
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AuthRequest: storageServerRequestValidate,
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BlockConnect: globalGridStart,
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TLSConfig: &tls.Config{
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RootCAs: globalRootCAs,
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CipherSuites: fips.TLSCiphers(),
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CurvePreferences: fips.TLSCurveIDs(),
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},
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// Record incoming and outgoing bytes.
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Incoming: globalConnStats.incInternodeInputBytes,
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Outgoing: globalConnStats.incInternodeOutputBytes,
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TraceTo: globalTrace,
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})
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if err != nil {
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return err
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}
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globalGrid.Store(g)
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return nil
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}
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